Axial-flow fan with tapered hub and duct

Details Axial-flow fan with tapered hub and duct Axial-flow fan with tapered hub and duct

1989-03-09

1990-09-25

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 63, 310 91, 415119, 416222, 416224, H02K 906, F04D 2952

Patent

active

049595717

ABSTRACT:
In an axial-flow fan, a motor support, a frame having a cylindrical inner surface, a boss fixed to the drive shaft and having a cylindrical outer surface, and blades radially extending from the cylindrical outer surface of the boss is provided legs for connecting the frame and motor support, and are also provided with surfaces inclined with respect to the direction of the air stream to reduce resistance to air flow. In another embodiment, the downstream end of the air duct defined by the cylindrical inner surface of the frame is gradually expanded toward the direction in which air is blown out. In a further embodiment, the upstream end of the boss has cut-away portions for enlarging the area of the cross section for air flow.

REFERENCES:
patent: 2926838 (1960-03-01), van Rijn
Radio Shack, "3" 120VAC Fan, '87 Catalog, p. 126.
"HLH" 27 Variation des Abstandes zwischen Laufrad und benachbarten Streben Ploner und Herz (17; 1969), HLH 27(1976) Nr. 8, Aug., pp. 288-290.

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